Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Biology

For the MN-blood group system, the frequencies of M and N alleles are 0.7 and 0.3, respectively. The expected frequency of MN-blood group bearing organisms is likely to be ______.

Which type of selection explains industrial melanism observed in moth, Biston bitularia?

In a certain population, the frequency of three genotypes is as follows:

What is the likely frequency of B and b alleles?

Among the five factors that are known to affect Hardy-Weinberg equilibrium, three factors are gene flow, genetic drift and genetic recombination. What are the other two factors?

State and explain any three factors affecting allele frequency in populations.

Gene flow occurs through generations. and can occur across language barriers in humans. If we have a technique of measuring specific allele frequencies in different population of the world, can we not predict human migratory patterns in pre-history and history? Do you agree or disagree? Provide explanation to your answer.

Enumerate three most characteristic criteria for designating a Mendelian population.

“Migration may enhance or blurr the effects of selection”. Comment.

Name the law that states that the sum of allelic frequencies in a population remains constant. What are the five factors that influence these values?

Give the full form of ELISA. Which disease can be detected using it? Discuss the principle underlying the test.

Can a disease be detected before its symptoms appear? Explain the principle involved.

What is a recombinant DNA vaccine? Give two examples.

Why is it that the line of treatment for a genetic disease is different from infectious diseases?

Discuss briefly how a probe is used in molecular diagnostics.

Who was the first patient who was given gene therapy? Why was the given treatment recurrent in nature?

Taking examples under each category, discuss upstream and downstream processing.

Define Antigen and Antibody. Name any two diagnostic kits based upon them.

How is a mature, functional insulin hormone different from its prohormone form?

How is a mature, functional insulin hormone different from its prohormone form?

When a foreign DNA is introduced into an organism, how is it maintained in the host and how is it transferred to the progeny of the organism?